<div>
    <div v-for="value in nav_data" class="subnav">
        <h3 class="no-extra"><i class="icon iconfont icon-unfold" :class="value.icon"></i>{{value.title}}</h3>
        <ul class="side-sub-menu">
            <li v-for="list in value.child" :class="{'current':list.id==actionId}">
                <a class="item" :href="list.url+'.html'">{{list.title}}</a>
            </li>
        </ul>
    </div>
</div>